Please tell us what the memory specs of your PC are (i.e. RAM), the version of Windows you are using (e.g. XP, Vista, 7, 8) and the version of GSAK you are using. If you don't know how much RAM you have installed, right click "My Computer" or "Computer" (depending on what version of Windows you have) and choose "Properties".
In the meantime, please restart your computer and run GSAK and attempt the import immediately after a restart. This should insure the maximum amount of memory is available.
In the meantime, please restart your computer and run GSAK and attempt the import immediately after a restart. This should insure the maximum amount of memory is available.